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Continuity mistake: The shot behind shows Dr.Cline swinging her flashlight to her far right to illuminate the cave drawings. The next shot to her front shows the flashlight straight and centered close to her body.

From the title (honoring writer Charles Beaumont) on, David Gerrold loaded this script with homages to sf writers and films. Every character and nearly every line makes such a reference, with people and things named after Ray Bradbury, Richard Matheson and characters from Invasion of the Body Snatchers, Them!, Forbidden Planet, This Island Earth and many others.